Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International



Home > Press > Conformal transfer of graphene for reproducible device fabrication

Reliable wafer scale production of graphene devices.
Reliable wafer scale production of graphene devices.

Abstract:
Conformal transfer of graphene on a prepatterned substrate is a viable technology for reproducible fabrication of graphene devices. Such is the conclusion of a recent study by a team of scientists from Germany, the Netherlands, Spain and Saudi Arabia.

Conformal transfer of graphene for reproducible device fabrication

San Sebastian, Spain | Posted on August 11th, 2015

Reliable fabrication of graphene devices for electronics has been a technological challenge for the graphene community for years. Large area high quality graphene, required for high-tech applications, is typically grown by chemical vapor deposition (CVD) on metal foils. Following growth, the graphene film is transferred to an electronically useful substrate, which is commonly SiO2 on Si. Standard procedure follows these steps up with photolithographic patterning of devices and evaporation of gold contacts.

In the past, this sequence of steps failed to result in devices of consistently high quality, as each fabrication step introduced unpredictable defects. The film growth was the first step to be perfected by a global network of busy scientists. Graphene transfer was in parallel mastered by the Spanish company Graphenea, a participant of this most recent breakthrough, as evidenced by their patent award earlier this year. Still, lithography and evaporation would cause film breaks, cracks and wrinkles, which were unpredictable and which lowered the quality of the final devices. Now, researchers have turned the fabrication upside down by performing lithography and contact evaporation prior to graphene transfer. The result is a reliable method for wafer-scale fabrication of graphene devices.

The paper, recently published in Applied Materials & Interfaces (a publication of the American Chemical Society), starts by considering the values reported in literature for contact and sheet resistance obtained with the standard graphene fabrication and transfer method. Focusing on graphene grown by CVD, the researchers find that there is significant scatter in the reported values, spanning nearly an order of magnitude. The scientists then performed the standard procedure themselves, finding that the resulting graphene sheet is inhomogeneous, with defects appearing in random places.

Following the improved process, in which the contact patterning and metal deposition are performed prior to the transfer, yields a much better result. The graphene sheet is smooth and uniform across the wafer, conformally covering the electrode structures. Electrical measurements indicate good device reproducibility, with sheet resistance low enough to consider using these graphene devices in radio frequency electronics. The potential application of the graphene channels is additionally confirmed by steady device performance over a wide range of applied current, up to 0.5 A. The careful fabrication led to devices that support the highest current density ever reported in transferred CVD graphene.

Over 600 devices were tested, showing a very narrow spread in the measured parameters. Such statistical similarity not only opens a gate to mass production of graphene devices for radio frequency applications, but immediately allows the testing of fundamental device physics of monolayer materials.

####

For more information, please click here

Contacts:
Headquarters
Graphenea
Avenida de Tolosa, 76
20018 - Donostia/San Sebastián
Spain

Copyright © Graphenea Inc.

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related News Press

Graphene/ Graphite

Breakthrough in proton barrier films using pore-free graphene oxide: Kumamoto University researchers achieve new milestone in advanced coating technologies September 13th, 2024

A 2D device for quantum cooling:EPFL engineers have created a device that can efficiently convert heat into electrical voltage at temperatures lower than that of outer space. The innovation could help overcome a significant obstacle to the advancement of quantum computing technol July 5th, 2024

First human trial shows ‘wonder’ material can be developed safely: A revolutionary nanomaterial with huge potential to tackle multiple global challenges could be developed further without acute risk to human health, research suggests February 16th, 2024

NRL discovers two-dimensional waveguides February 16th, 2024

Chip Technology

New discovery aims to improve the design of microelectronic devices September 13th, 2024

Groundbreaking precision in single-molecule optoelectronics August 16th, 2024

Enhancing electron transfer for highly efficient upconversion: OLEDs Researchers elucidate the mechanisms of electron transfer in upconversion organic light-emitting diodes, resulting in improved efficiency August 16th, 2024

Physicists unlock the secret of elusive quantum negative entanglement entropy using simple classical hardware August 16th, 2024

Discoveries

Energy transmission in quantum field theory requires information September 13th, 2024

Breakthrough in proton barrier films using pore-free graphene oxide: Kumamoto University researchers achieve new milestone in advanced coating technologies September 13th, 2024

Quantum researchers cause controlled ‘wobble’ in the nucleus of a single atom September 13th, 2024

New nanomaterial could transform how we visualise fingerprints: Innovative nanomaterials have the potential to revolutionise forensic science, particularly in the detection of latent (non-visible) fingermarks September 13th, 2024

Materials/Metamaterials/Magnetoresistance

How surface roughness influences the adhesion of soft materials: Research team discovers universal mechanism that leads to adhesion hysteresis in soft materials March 8th, 2024

Nanoscale CL thermometry with lanthanide-doped heavy-metal oxide in TEM March 8th, 2024

Focused ion beam technology: A single tool for a wide range of applications January 12th, 2024

Catalytic combo converts CO2 to solid carbon nanofibers: Tandem electrocatalytic-thermocatalytic conversion could help offset emissions of potent greenhouse gas by locking carbon away in a useful material January 12th, 2024

Announcements

Giving batteries a longer life with the Advanced Photon Source: New research uncovers a hydrogen-centered mechanism that triggers degradation in the lithium-ion batteries that power electric vehicles September 13th, 2024

NYU Abu Dhabi researchers develop novel covalent organic frameworks for precise cancer treatment delivery: NYU Abu Dhabi researchers develop novel covalent organic frameworks for precise cancer treatment delivery September 13th, 2024

New discovery aims to improve the design of microelectronic devices September 13th, 2024

New method in the fight against forever chemicals September 13th, 2024

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

Rice research could make weird AI images a thing of the past: New diffusion model approach solves the aspect ratio problem September 13th, 2024

Breakthrough in proton barrier films using pore-free graphene oxide: Kumamoto University researchers achieve new milestone in advanced coating technologies September 13th, 2024

Quantum researchers cause controlled ‘wobble’ in the nucleus of a single atom September 13th, 2024

New nanomaterial could transform how we visualise fingerprints: Innovative nanomaterials have the potential to revolutionise forensic science, particularly in the detection of latent (non-visible) fingermarks September 13th, 2024

Patents/IP/Tech Transfer/Licensing

Getting drugs across the blood-brain barrier using nanoparticles March 3rd, 2023

Study finds nanomedicine targeting lymph nodes key to triple negative breast cancer treatment: In mice, nanomedicine can remodel the immune microenvironment in lymph node and tumor tissue for long-term remission and lung tumor elimination in this form of metastasized breast cance May 13th, 2022

Metasurfaces control polarized light at will: New research unlocks the hidden potential of metasurfaces August 13th, 2021

Arrowhead Pharmaceuticals Announces Closing of Agreement with Takeda November 27th, 2020

Research partnerships

Gene therapy relieves back pain, repairs damaged disc in mice: Study suggests nanocarriers loaded with DNA could replace opioids May 17th, 2024

Discovery points path to flash-like memory for storing qubits: Rice find could hasten development of nonvolatile quantum memory April 5th, 2024

Researchers’ approach may protect quantum computers from attacks March 8th, 2024

How surface roughness influences the adhesion of soft materials: Research team discovers universal mechanism that leads to adhesion hysteresis in soft materials March 8th, 2024

New-Contracts/Sales/Customers

Bruker Light-Sheet Microscopes at Major Comprehensive Cancer Center: New Advanced Imaging Center Powered by Two MuVi and LCS SPIM Microscopes March 25th, 2021

Arrowhead Pharmaceuticals Announces Closing of Agreement with Takeda November 27th, 2020

Veeco Announces Aledia Order of 300mm MOCVD Equipment for microLED Displays: Propel™ Platform First 300mm System with EFEM Designed for Advanced Display Applications October 20th, 2020

GREENWAVES TECHNOLOGIES Announces Next Generation GAP9 Hearables Platform Using GLOBALFOUNDRIES 22FDX Solution October 16th, 2020

RFID

Nanowire 'inks' enable paper-based printable electronics: Highly conductive films make functional circuits without adding high heat January 4th, 2017

GLOBALFOUNDRIES Launches Industry’s First 22nm FD-SOI Technology Platform: 22FDX offers the best combination of performance, power consumption and cost for IoT, mainstream mobile, RF connectivity, and networking July 13th, 2015

New micro-supercapacitor structure inspired by the intricate design of leaves: A team of scientists in Korea has devised a new method for making a graphene film for supercapacitors July 2nd, 2015

Designer electronics out of the printer: Optimized printing process enables custom organic electronics June 16th, 2015

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project